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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9e7a3660b58d165121a1d179a7260cd7f5b59c07455e781ab90b80bedef98b' 
  AND token = 'flmp78tKOQgdb76CobAKR4cJ7kv7U2ZrNxBHMX1yklE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}